Pneumatic tube



G. F. ARMSTRONG Dec. 8 1925.

PNEUMATIC TUBE Filed May 29. 192s' Patented Dec. 8, 1925-.A

l unirse As'ra'rlazs GEORGE F. ARHSTRQNG, 0F RUTHEIFORD, NEW JERSEY.

PNEUMATC TUBE.

Appncatmn sled my 29, 1923. serial No. 642,237.

To all whom t may concern:

Be it known that I, Groen F. ARM- STRONG, a citizen of the United States, re-

' siding in Rutherford, in the county of Bergen and State of New Jersey, have invented certain new and Lseful Improvements in Pneumatic Tubes, of which the following is a specification.

This invention relates tothe inner tubes of pneumatic tires` of the clincher type though it is noted that the invention isnot limited to this particular type of tire nor in some respects even toftires.

Gne object of the invention is to rovide an inner tube of this kind in which t e tube body is prevented from being caught between the toes of the shoe of the tire.

Another object of the invention is to provide a tube of this kind which is resistant enough to resist the chang wear of the toes and the rim during the life of the tube.

Another object of the invention is to provide for a tire of this kind, or for general.

application, an improved slippery rubber which will minimize friction on the rubber, thus making for long life and easy j manipulation..

Another objectof. the invention is to eliminate the usual Hap or liner such as is generally utilized by locatin the same between the tube, thetire rim, an the bead portions of the tire, thereby to prevent pinching of` the tube by beads and also to prevent adherence of the tube to the rim by corrosion. This particular feature does away with the necessity of handling an extra piece.

Other objects of the invention are to improve generally the simplicity and efiiciency of such tire and rubber and to rovide a tire and rubber of this kind whic are du- The inventive features for the accomplishment of these and other objects are shown in two forms of inner tube, here illustrated in a tire shoe applied to a rim of a wheel.

:Other objects of the invention will appear as the descri tion proceeds; and while herein details of t e invention are described, the invention is not limited to these, since many and various changes may be made without departing from the scope of the j invention as claimed.

In the accompanying drawings, showing by way of example, two of many possible embodiments of thev invention,

Figs. 1 and 2 are respectively cross-section and side elevation of a tire showing one form of. inner tube; and

Figs. -8 and 4 are respectively cross-section and side elevation showing another form of inner tube.

In Figs. 1 and 2, the improved inner tube is shown in combination with a tire shoe 5, comprising a main bod portion 6, a tread 7 on the outer part o the 'main Yportion, and beads 8 at the mar 'ns of the shoe ada ted to be held by t e flange 9 of the w eel rim 10 for holding the shoe on the rim, said beads having spaced pointed inner edges or toes disposed toward each other.

The inner tube in said shoe comprises a tube body 14: of flexible red rubber and a white contrasting strip 15 of toug stiff, slippery abrasion-resistant white rubber inlaid and vulcanized in the outer face of the inner part of the wall of the tube body, bridging between the toes 18 and lying in contactV with the rim 10 and the wall-faces 19 of the shoe adjacent to the toes.

Said strip is stiff and slippery enough to cause its edge portions 20 to shp along' said wall-faces away from vthe toe edges, the strip being sti enough to prevent the strip or tube body from being caught between the toes during inflation. The strip is also resistant enough to resist the chalng wear of the toes 18 and the rim 10 during the life of the tube. Said strip is made with some slip er substances such as mica or soapstone or both incor orated therein but is preferably made by t e following formula: rubber, fifty pounds,y zinc oxide, forty-five pounds, mica,

rable and economical to manufacture and two pounds, sulphur, one pound and four- 4convenient to manipulate. i

teen ounces, hexamethylenetetraine, seven ounces. l

It is noted that the usual reinforced loose protecting strip covering the gap 17 is omitted.

In Figs. 3 and 4 the tire shoe 5 and the rim are the same as in Fi s. 1 and 2; but the strip 15 of tough, sti sli pery abrasion-resistant rubber is laid andp vulcanized on the outer face of the inner art 16 of thewall of the tube body 14s, bridgi the gap 17 between the toes, with its roun ed `exposed edges 20 in contact with the wall-faces 19 of the shoe adjacent to the toes. Said strip 15 functions the same way as the strip 15.

Both inner tubes are used, and manipulated the same as ordinary inner tubes, exce t that the usual flap or liner is omitted.

he contrasting white strip 15 or 15 on the red body of the tube forms an inner tube of pleasingapearance, and may serve as a convenient tra I claim:

1. An inner tube or tires including a flexible rubber tube havin secured to the 'inner periphery so as to orm an integral art thereof, a protecting layer constituting a tire fiap, said flap forming layer composed solely of a homogeneous rubberized compound equally expandible both longi-` e-mark.

tudinally and transversely with the tube, more resistant to abrasion than the flexible tube, being stiffer than the flexible tube and said compound containing a material which gives to the tire flap a slippery, exposed surface.

2. An inner tube for tires comprising a flexible rubber tube having secured to its inner periphery a reinforcingstrip formed solely of a homogeneous rubber stock more resistant to abrasion than the flexible tube, such stock containingv mica incorporated therein whereby the exposed side of the.

strip is caused to be smooth and slippery to minimize friction and to prevent adher ence of the tube to the tire rim.

GEORGE F. ARMSTRONG. 

